The H&R was one of th many American makers offering bolt action shotguns in te late 40s and early 50s. your gun likely has 2 3/4" chambers and is valued at $50 to $100, depending on condition. Have a good day.. Bushrod

thanks busrod,this might sound wierd,but could u mount a low powered scope on this gun and shoot it with rifled slugs.
I know the accuracy wouldnt be match quality but would this be ok for shots up to lets say 40-50 yards or there abouts
look forward to your reply

Don't know if a late reply will get read, but I bought one for $50 a few years ago. I could find no chamber size indications so I measured to the ridge on the inside of the chamber and came up with 3". The only other possible hint his the prominent "M" which appears next to the "12 ga." on the receiver. I could be wrong but I have a hunch that the "M" is for "magnum" which many years ago meant 3". I have fired 3" shells from mine but won't make a habit out of it.